You may be mixing two ideas. In Jainism, “5 kāy jīv” means the five bodies (kāy) of one‑sensed beings:

• Prithvī‑kāy (earth‑bodied)
• Ap‑kāy (water‑bodied)
• Tej‑kāy (fire‑bodied)
• Vāyu‑kāy (air‑bodied)
• Vanaspatī‑kāy (plant‑bodied)

About a “fan”: when a fan moves air, it disturbs and can injure countless vāyu‑kāy jīv (air‑bodied) and may also harm tiny mobile beings (micro‑insects) carried in the airflow. So, yes—using a fan can involve dravya‑hiṁsā (actual injury) to subtle beings, especially at high speed or when blowing directly on lamps (tej‑kāy), water (ap‑kāy), soil (prithvī‑kāy), or plants (vanaspatī‑kāy).

Practical Jain guidance for laypeople (both Śvetāmbara and Digambara agree on the principle of ahiṁsā):

• Use a fan only when needed; prefer natural ventilation.
• Keep speed low; avoid directing airflow at lamps, water bowls, food, plants, or where insects gather.
• Keep lights covered so insects are not drawn into the airflow.
• Maintain cleanliness to avoid attracting tiny creatures.

Monks/nuns observe far stricter restraint; householders practice minimization (sātvika upayog) while accepting some unavoidable hiṁsā in worldly life.

For simple references on these categories of jīva, see:

• One‑sensed bodies like prithvī‑kāy explained here
• Overall classification of jīva (sthāvar/tras, 1 to 5 senses) here
• Why hiṁsā leads to bad karma (and thus should be minimized) here